#include<stdio.h>
int main()
{
	int x;
	printf("please enter any number\n");
	scanf_s("%d", &x);
	if (x >= 85 && x <= 100)
	{
		int A;
		printf("A");
	}
	else if (x >= 70 && x <= 80 )
	{
		int B;
		printf("B");
	}
	else if(x >= 60 && x <= 69) {
		int c;
		printf("C");}
	else {
		int D;
		printf("D"); }
		return 0;
}